Power handsaw



L. M. REED POWER HANDSAW Filed March 50, 19275 Patented dan. 12, 1926.

UNITED STitiTEi LEONARD M. REED, F DEXTER, JSQWZA.

POWER HANDSAW.

Application filed March 30, 1925.

To @ZZ whom t may concern:

Be it known that I, Lnonnnn M. Rnnn, a citizen oit the United States of America, and resident of Dexter, Dallas County, iowa, have invented a new and useful tower Handsaw, ot' which the following is a specification.

rihe oloject of this invention is to provide an iniproved 1notor-operated reciprocating saw adapted, tor hand use.

.li further object oi this invention is to provide a motor-operated hand saw which is selicontained, the motor oeing enclosed in a housing which also contains the gearing jt'or causing the reciprocating movement.

it. further object et this invention is to provide an improved inotoihoperated hand saw which is of simple. and relatively inexpensive construction but e'li'ic-ient in use.

A further object ot this invention is to facilitate the operatoi"s control over the saw and the driving means.

A. further object ot this invention is to provide a motor-driven saw in which the blade niay readily be detached and substituted by another.

l/Vith these and other objects in view, my invention consists in the construction, arrangement and combination oit elements hereinafter' set iiorth, pointed out in the clainis and illustrated by the accompanying drawing, in which .Figure l. is a side View oi my in'iproved device. Figure 2 is an enlarged cross-section taken on the line 2--2 of liligure 1. lligurez-i 3 and 11 are longitudinal sections on the lines l--l and et---i respectively olf iigurc 2. Figure 5i is a detail section on the line oit Figure l-, and Figure 6 is a detail section on the line 6 5 ot Figure 3.

in the construction ot the device as shown the nunicral 10 designates a cylindricalhousing, the upper end oit which is normally closed by a screwthreaded deine-shaped cap 11. .tittached to the outside oit the housing 10 is a handle 12 by which the device may he held and nninipulated. it, carriage 13 is arranged tranfufersely within the housing 1U and is adapted for reciprocation longitudh naliy thereof, being iforined at its ends with tongues projecting within grooves 15 iforn'ied in opposite portions oi the `walls ot said housing and arranged lengthwise thereof. tit/ops 16 are provided at the ends oii the grooves or tracks 153, and cushitining springs 't7' are mounted on said stops to Serial` No. 19,239.

cushion the carriage 13 at each end of its range et travel. A saw blade such as 18 is attached at itsbase to the carriage 13 as by rneans oi' bolts 19, the major portion ot said blade projecting out through the open or partially open lower end ot' the housing. i number ot blades niay be provided for use with a given device, which blades may be ot dilierent character it desired, and acis had to the fastening bolts through an opening in the side of the housing, normally closed by a door 20.

it. boxing 21 is arranged for reciprocatioix on the carriage 13, being guided in a slot or opening termed lengthwise of said carriage. hliounted on and carried by the boxing 21 is an electric inotor 23, the shaft of which is connected by sprocket gearing 24 to a countershaift 25 journaled in the boxing 21 and extending diainetrically ot the housing, at right angles to the carriage 13. Endless racks 2G, 27 are arranged longitudinally of and at opposite sides of the interior of the housing 10, said racks being et substantially elliptical forni and having outwardly directed teeth. Elliptical grooves or' tracks 2S are torined in the walls ci the housing adjacent and in embracing relation to the racks 26, 2?, and the ends ot the countershait 25 project within and are guided by said grooves or tracks. Pinions 29, 3() are fixed to end portions oit the countershait 25 and are in inesh with and adapted to travel on the racks 2G, 2i" respectively.

'ihe inotor 23 is supplied with current by conductors 31, 32 in circuit with any suit-- able source. of electrical energy, and if desired a switch 33 may be located in said circuit and a convenient place for said switch ison the handle 12 as shown, where it inay be manipulated by the operator Witliout moving his hand away from the handle, or held in closed position by one finger While the hand is gripping the handle.

1n practical use the saw is held in the usual way and when the switch is closed the motor is operated and drives the sprocket gearing 24 and countershatt 25, thus rotating the pinions 29, 30 and causing them to travel on the racks 26 and 27 respectively. This travel causes a rectilinear reciproca.-

tion of the carriage 13 in the housing,-

guided on the tracks 1li, and carrying with it the blade 1S which is used in the sawing operation, under the guide and control of the operator. The pinions pass from one long side to the other of the racks at their` rounded ends, and the long sides of said racks are as close together as practicable so that little transverse movement is required in passing from one side to the other. This transverse movement is permitted by the sliding movement of the boxing 21 in the track or opening 22 of the carriage, and such movement may be cushioned by springs 3e, 35 at the ends. rlhe motor 225 oi? course travels With the boxing 2l in its transverse movements, Which in turn travels with the carriage in its longitudinal movements, and the conductors 31, 32 are ontl such length and flexibility as not to intertere with such travel.

I; claim as my inventionl. A. power-driven hand saw, comprising a casing, a carriage arranged tor rectilinear reciprocation therein, a saw blade iXed to said carriage and having its major portion projecting therefrom, a in otor on and adapted for reciprocation with said carriage, and means connected With said motor for causing said carriage to reciprocate in said casing.

2. A power-driven hand saw, comprising a casing, a carriage arranged for rectilinear reciprocation therein, a saw blade iXed to said carriage and having its major portion projecting from said casing, a motor on and adapted for reciprocation With said carriage, means 'for cushioning said carriage at the ends ot the range of movement, and gearing mechanism operated from said motor to cause said carriage to reciprocate in said casing.

3. A power-driven hand saw, comprising a casing, a carriage arranged for reciprocation longitudinally thereof, a saw blade iixed to said carriage and having its major por tion projecting Afrom said casing, a rack carried by the wall or" said casing, a motor on and adapted t'or reciprocation with said carriage, a countershatt arranged for rotation, and connected with said carriage, a pinion on said countershatt in mesh With said rack and adapted to travel thereon, and gearing operatively connecting said motor to said countershait.

4. A power-driven hand saw, comprising a casing, an endless rack of elliptical form carried by the Wall thereof and extending longitudinally thereof, a carriage arranged `tor reciprocation in said casing, a boxing arranged tor limited reciprocation on said carriage transversely of said casing, a motor carriedby said boxing, a eountershaft journaled in said boxing, gearing mechanism between said motor and countershatt, a pinion on said countershaft meshing with and adapted for travel on said rack, and a saw blade attached to said carriage and having its .major portion extending outside ot said casing.

i power-driven hand saw, comprising a casing, an endless rack ot' substantially elliptical form carried by and longitudinally or the wall ot the casing, longitudinal guides in the Walls of said casing, a carge arranged for travel in said guides, a ing arranged tor limited reciprocation on said carriage transversely of said casing, a motor carried by said boxing, a countershaft journaled in said boxing, sprocket (fearing operatively connecting the motor tt to said countershat't, a pinion on said countershatt meshing with and adapted for travel on said elliptical rack, and a saw blade detachably connected with said carrage.

ii power-driven hand saw, comprising an endless rack ot substantially p i.- liorm arranged longitudinally oit vsall oi`I the casing, acarriage arranged ifortravel longitudinally osaid casing, a gering arranged 'for limited reciprocation on s: d carriage transversely ot the casing, means for cushioning said boxing at the ends of its range of movement, a motor carried by said boxing, a countershaft journaled in said boxing, gearing operatively connecting the motor shaft to said countershatt, a pinion on said conntershaft meshing with and adapted for travel on said eliptical rack, and a saw blade secured to said carriage.

Signed at Dexter, in the county of Dallas and State of ovva, this 28th day of February, 1925.

Fil

LEONARD M. REED. 

